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David Wells

Builder of things

Serverless Architectures
User Experience & Product

Serverless, User Experience & Product

Remove every regex match from a string except for the first occurrence with JavaScript

Remove every regular expression match from a string except for the first occurrence.

This is handy for removing or replacing matches in a string after the first one.

function removeDuplicateRegexMatchesExceptFirst (string, regex) {
  var count = 0
  var replaceWith = ''
  return string.replace(regex, function (match) {
    count++
    if (count === 1) {
      return match
    } else {
      return replaceWith
    }
  })
}

var string = 'Button__button___2a549 myprefix-action-button-component Button__action___3EoEX myprefix-button-component'
var regex = /myprefix-[a-zA-Z0-9-]*-component/gm
removeDuplicateRegexMatchesExceptFirst(string, regex)
// "Button__button___2a549 myprefix-action-button-component Button__action___3EoEX "

Regex for the win!